/* ===========================
   Header & Navigation Styles
   =========================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--bg-white);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-medium);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
  gap: var(--spacing-md);
}

/* Logo Wrapper */
.logo-wrapper {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 100px;
  width: auto;
  transition: transform var(--transition-base);
}

.logo:hover img {
  transform: scale(1.05);
}

/* Certification Badge */
.certification {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: var(--spacing-sm);
  border-left: 3px solid var(--primary-color);
}

.cert-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  font-size: 13px;
  font-weight: var(--font-weight-bold);
  border-radius: 6px;
  white-space: nowrap;
  box-shadow: 0 3px 8px rgba(102, 126, 234, 0.4);
  transition: all var(--transition-base);
}

.cert-badge:hover {
  transform: translateY(-1px);
  box-shadow: 0 5px 12px rgba(102, 126, 234, 0.5);
}

.cert-icon {
  width: 20px;
  height: 20px;
  object-fit: contain;
  filter: brightness(0) invert(1);
}

.cert-number {
  font-size: 11px;
  color: var(--text-secondary);
  white-space: nowrap;
  padding-left: 2px;
  font-weight: var(--font-weight-medium);
}

/* Navigation Menu */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  list-style: none;
  margin: 0 auto;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  transition: all var(--transition-base);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 80%;
  height: 2px;
  background: var(--primary-color);
  transition: transform var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: translateX(-50%) scaleX(1);
}

/* CTA Button */
.nav-cta {
  flex-shrink: 0;
  padding: 10px 24px;
  font-size: var(--font-size-small);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: var(--z-fixed);
}

.mobile-menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  border-radius: 3px;
  transition: all var(--transition-base);
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(7px, 7px);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }

  .logo-wrapper {
    gap: 8px;
  }

  .logo img {
    height: 60px;
  }

  .certification {
    gap: 3px;
    padding-left: 8px;
    border-left-width: 2px;
  }

  .cert-badge {
    padding: 4px 10px;
    font-size: 11px;
    gap: 4px;
  }

  .cert-icon {
    width: 16px;
    height: 16px;
  }

  .cert-number {
    font-size: 9px;
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--bg-white);
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    overflow-y: auto;
    box-shadow: var(--shadow-medium);
  }

  .nav-menu.active {
    transform: translateX(0);
  }

  .nav-link {
    width: 100%;
    padding: var(--spacing-sm);
    text-align: center;
    font-size: var(--font-size-large);
  }

  .nav-cta {
    display: none;
  }
}

/* Extra Small Devices */
@media (max-width: 480px) {
  .certification {
    display: none;
  }
}